Ends-in vs. ends-out recombination in yeast. (original) (raw)
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Published:
01 December 1993
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P J Hastings, C McGill, B Shafer, J N Strathern, Ends-in vs. ends-out recombination in yeast., Genetics, Volume 135, Issue 4, 1 December 1993, Pages 973–980, https://doi.org/10.1093/genetics/135.4.973
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Abstract
Integration of linearized plasmids into yeast chromosomes has been used as a model system for the study of recombination initiated by double-strand breaks. The linearized plasmid DNA recombines efficiently into sequences homologous to the ends of the DNA. This efficient recombination occurs both for the configuration in which the break is in a contiguous region of homology (herein called the ends-in configuration) and for "omega" insertions in which plasmid sequences interrupt a linear region of homology (herein called the ends-out configuration). The requirements for integration of these two configurations are expected to be different. We compared these two processes in a yeast strain containing an ends-in target and an ends-out target for the same cut plasmid. Recovery of ends-in events exceeds ends-out events by two- to threefold. Possible causes for the origin of this small bias are discussed. The lack of an extreme difference in frequency implies that cooperativity between the two ends does not contribute to the efficiency with which cut circular plasmids are integrated. This may also be true for the repair of chromosomal double-strand breaks.
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© Genetics 1993
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